管理旧数据

When there are changes in how data is stored on disk, Jenkins uses the following strategy: data is migrated to the new structure when it is loaded, but items/records are not resaved in the new format. This allows for downgrading Jenkins if necessary. However, it can also leave data on disk in the old format indefinitely. The table below lists items/records containing such data, and the Jenkins version(s) where the data structure was changed.

Sometimes errors occur while reading data (if a plugin adds some data and that plugin is later disabled, if migration code is not written for structure changes, or if Jenkins is downgraded after it has already written data not readable by the older version). These errors are logged, but the unreadable data is then skipped over, allowing Jenkins to start up and function properly.

类型	名称	版本	Error

未找到旧数据。

不可读数据

It is ok to leave unreadable data in these items/records, as Jenkins will simply ignore it. To avoid the log messages at Jenkins startup you can permanently delete the unreadable data by resaving these items/records using the button below the list.

类型	名称	Error
hudson.model.User	dev	CannotResolveClassException: com.cloudbees.plugins.credentials.UserCredentialsProvider$UserCredentialsProperty, CannotResolveClassException: hudson.plugins.favorite.user.FavoriteUserProperty, CannotResolveClassException: hudson.tasks.Mailer$UserProperty
hudson.model.FreeStyleProject	Fzx平台-开发环境自动部署流水线	CannotResolveClassException: org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition
hudson.tasks.Maven$DescriptorImpl	Invoke top-level Maven targets	ConversionException: ---- Debugging information ---- cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException cause-message : hudson.tasks.Maven_MavenInstallation class : [Lhudson.tasks.Maven$MavenInstallation; required-type : [Lhudson.tasks.Maven$MavenInstallation; converter-type : com.thoughtworks.xstream.converters.collections.ArrayConverter path : /hudson.tasks.Maven$DescriptorImpl/installations/hudson.tasks.Maven_MavenInstallation line number : 4 -------------------------------